Differences

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--- os:linux:start [2014-07-06 10:15] – add mail forward root
+++ os:linux:start [2021-08-14 23:54] – Manuel Frei
@@ Line 1: / Line 1: @@
 ====== Linux ======
+  * [[os:linux:kernel-tuning|Kernel-Tuning]]
   * [[os:linux:read_hfsplus|Read HFS+ Partition]]
+  * [[os:linux:multimedia|Multimedia]]
-== Backup directory ==
+  * [[os:linux:create_swap_file|Create Swap File]]
+  * [[os:linux:powerdns_apache_postgresql_debian|PowerDNS via Apache2 with PostgreSQL on Debian and PowerDNS-Admin]]
+  * [[os:linux:lemur_and_cfssl_with_nginx_and_postgresql_on_centos8:lemur_and_cfssl_with_nginx_and_postgresql_on_centos8]]
+  * [[os:linux:file_watcher_service|File Watcher Service]]
+  * [[os:linux:tmux|tmux]]
+==== Backup directory ====
   rsync -vr /home/user/important_directory /media/some_hdd/backups/
 **Hint:** With a / at the end of the first directory, all sub directories are copied directly to the destination folder. Without / it will create the source folder (ex. important_directory) with all sub directories are copied to the destination folder
-== Forward Mails of A User ==
+==== Forward Mails of A User ====
 You have a server for example and some mails are sent directly to root. The easiest way to forward them to a real address ist to create a .forward file.
@@ Line 14: / Line 21: @@
 /root/.forward
 <code>
-  user@example.org
+user@example.org
 </code>
 **Immportant:** The last line of the file have to be empty. It won't work without newline.
+Misconfiguration may result in following log lines of your mail server:
+<code>
+Jul  6 10:10:48 myHostName postfix/cleanup[362]: 4E14342D46: message-id=<20140706081048.4E14342D46@mail.example.org>
+Jul  6 10:10:48 myHostName postfix/qmgr[24720]: 4E14342D46: from=<>, size=2540, nrcpt=1 (queue active)
+Jul  6 10:10:48 myHostName postfix/bounce[368]: 3D46942C3D: sender non-delivery notification: 4E14342D46
+Jul  6 10:10:48 myHostName postfix/smtp[367]: 4E14342D46: to=<root@mail.example.org>, relay=none, delay=0.04, delays=0.01/0/0.03/0, dsn=5.4.6, status=bounced (mail for mail.example.org loops back to myself)
+Jul  6 10:10:48 myHostName postfix/qmgr[24720]: 4E14342D46: removed
+</code>
+==== Validate XML Against Template ====
+<code>
+xmllint --schema schema.xsd --noout file.xml
+</code>
+or
+<code>
+xmlstarlet val -s schema.xsd -e file.xml
+</code>
+==== Links ====
+  * [[https://eklitzke.org/stdout-buffering|Stdout Buffering]]
+  * [[https://eli.thegreenplace.net/2018/measuring-context-switching-and-memory-overheads-for-linux-threads/|Measuring context switching and memory overheads for Linux threads]]
+  * [[https://linoxide.com/how-to-check-disk-queue-length-in-linux/|How to Check Disk Queue Length in Linux]]